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that could mean that your water pump impeller is broken. when you press the gas the remaining piece of the impeller is pushing the water and it actually makes it to the heater core. at idle it isn't spinning fast enough. ask a local autoparts store if the impeller is made of plastic.
Nothing in or around the heater core could make a noise. The core is just a small radiator with coolant circulating through it. And if you feel both heater hoses, and both are hot on a warmed up engine, then coolant is circulating through the core and the heat should be working. There must be a door in the heater case that is not letting heat come out.
The noise may be from the blower motor and its plastic fan assembly. It should be pretty easy to take out the blower motor and check for any obstruction.
no the thermostat must be working or your engine would not heat up, check to see if your heater hoses are hot if only one is hot you need a heater core, but check your coolent level if the van gets low on coolent it will not let any get to the heater thehope engine keeps it all to keep the engine cool....hope this helps
Check the coolant level. If it's low, what you describe will happen. There is not sufficient coolant to flow through the heater core at idle. At 60mph the water pump is spinning quickly, managing to get some coolant through the heater core, so you get heat until the rpm's drop at idle. If it is due to low level, keep an eye on it to see if it drops again, as you may have a leak.
Blend air door may be stuck. I removed a pencil from a heater box before. It had fallen from the dash, down through the defrost vents and jamed the door.
You will have to service your cooling system including the heater core which supplies heat to the cabin. Also, if you have not had your thermostat replaced, now is a good time to do it before it malfunctions. A heater core replacement may be needed.
U must remove the entire dash assembly to replace the blend door actuator motor, it is approx center on dah on the out side of heater/AC air ducting. This is no a job for a DIYer.
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